If you want free groceries delivered through Amazon Fresh from the end of February, you’re going to have to buy a lot more stuff. Currently, for the Amazon Prime subscription service, you get free delivery on orders over $35. But starting February 28, you only get free delivery on orders over $150.

Lower totals require you to pay a service charge that differs based on how much you buy. Orders between $100 and $150 have a delivery charge of $3.95, orders between $50 and $100 have $6.95, and orders under $50 have $9.95.

“The service fee helps keep prices low in our online and brick-and-mortar supermarkets because we can better cover grocery delivery costs and continue to provide a consistent, fast, and high-quality delivery experience,” Amazon wrote. on an Amazon Fresh page stating the changes.

I don’t quite get the logic here; adding costs and putting free delivery further out of reach seems to ultimately make the total prices higher for customers, and the changes add notable costs to a service that already requires an Amazon Prime subscription. Since Prime has also recently become a more expensive proposition, these Amazon Fresh adjustments may be even harder for customers to swallow. People don’t seem happy, some say tweet I have seen.

Amazon began notifying customers about the change on Friday. The company did not immediately respond to a request for comment.